A new mass balance model for the coupled marine cycles of phosphorus (P) and carbon (C) is used to examine the relationships between oceanic circulation, primary\ud productivity, and sedimentary burial of reactive P and particulate\ud organic C (POC), on geological time scales. The model explicitly represents the exchanges of water and particulate\ud matter between the continental shelves and the open ocean, and it accounts for the redox-dependent burial of POC and\ud the various forms of reactive P (iron(III)-bound P, particulate organic P (POP), authigenic calcium phosphate, and fish\ud debris). Steady state and transient simulations indicate that\ud a slowing down of global ocean circulation decreases primary\ud production in the open ocean, but increases that in the coastal ocean. The latter is due to increased transfer of soluble\ud P from deep ocean water to the shelves, where it fuels\ud primary production and causes increased reactive P burial.\ud While authigenic calcium phosphate accounts for most reactive\ud P burial ocean-wide, enhanced preservation of fish debris\ud may become an important reactive P sink in deep-sea\ud sediments during periods of ocean anoxia. Slower ocean circulation\ud globally increases POC burial, because of enhanced\ud POC preservation under anoxia in deep-sea depositional environments\ud and higher primary productivity along the continental\ud margins. In accordance with geological evidence, the\ud model predicts increased accumulation of reactive P on the\ud continental shelves during and following periods of ocean\ud anoxia
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